Libav
libvorbis.c
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1 /*
2  * copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
27 #include <vorbis/vorbisenc.h>
28 
29 #include "libavutil/fifo.h"
30 #include "libavutil/opt.h"
31 #include "avcodec.h"
32 #include "audio_frame_queue.h"
33 #include "bytestream.h"
34 #include "internal.h"
35 #include "vorbis.h"
36 #include "vorbis_parser.h"
37 
38 #undef NDEBUG
39 #include <assert.h>
40 
41 /* Number of samples the user should send in each call.
42  * This value is used because it is the LCD of all possible frame sizes, so
43  * an output packet will always start at the same point as one of the input
44  * packets.
45  */
46 #define LIBVORBIS_FRAME_SIZE 64
47 
48 #define BUFFER_SIZE (1024 * 64)
49 
50 typedef struct LibvorbisContext {
52  vorbis_info vi;
53  vorbis_dsp_state vd;
54  vorbis_block vb;
56  int eof;
58  vorbis_comment vc;
60  double iblock;
64 
65 static const AVOption options[] = {
66  { "iblock", "Sets the impulse block bias", offsetof(LibvorbisContext, iblock), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, -15, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
67  { NULL }
68 };
69 
70 static const AVCodecDefault defaults[] = {
71  { "b", "0" },
72  { NULL },
73 };
74 
75 static const AVClass class = { "libvorbis", av_default_item_name, options, LIBAVUTIL_VERSION_INT };
76 
77 
78 static int vorbis_error_to_averror(int ov_err)
79 {
80  switch (ov_err) {
81  case OV_EFAULT: return AVERROR_BUG;
82  case OV_EINVAL: return AVERROR(EINVAL);
83  case OV_EIMPL: return AVERROR(EINVAL);
84  default: return AVERROR_UNKNOWN;
85  }
86 }
87 
88 static av_cold int libvorbis_setup(vorbis_info *vi, AVCodecContext *avctx)
89 {
90  LibvorbisContext *s = avctx->priv_data;
91  double cfreq;
92  int ret;
93 
94  if (avctx->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) {
95  /* variable bitrate
96  * NOTE: we use the oggenc range of -1 to 10 for global_quality for
97  * user convenience, but libvorbis uses -0.1 to 1.0.
98  */
99  float q = avctx->global_quality / (float)FF_QP2LAMBDA;
100  /* default to 3 if the user did not set quality or bitrate */
101  if (!(avctx->flags & CODEC_FLAG_QSCALE))
102  q = 3.0;
103  if ((ret = vorbis_encode_setup_vbr(vi, avctx->channels,
104  avctx->sample_rate,
105  q / 10.0)))
106  goto error;
107  } else {
108  int minrate = avctx->rc_min_rate > 0 ? avctx->rc_min_rate : -1;
109  int maxrate = avctx->rc_max_rate > 0 ? avctx->rc_max_rate : -1;
110 
111  /* average bitrate */
112  if ((ret = vorbis_encode_setup_managed(vi, avctx->channels,
113  avctx->sample_rate, maxrate,
114  avctx->bit_rate, minrate)))
115  goto error;
116 
117  /* variable bitrate by estimate, disable slow rate management */
118  if (minrate == -1 && maxrate == -1)
119  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE2_SET, NULL)))
120  goto error;
121  }
122 
123  /* cutoff frequency */
124  if (avctx->cutoff > 0) {
125  cfreq = avctx->cutoff / 1000.0;
126  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq)))
127  goto error;
128  }
129 
130  /* impulse block bias */
131  if (s->iblock) {
132  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_IBLOCK_SET, &s->iblock)))
133  goto error;
134  }
135 
136  if ((ret = vorbis_encode_setup_init(vi)))
137  goto error;
138 
139  return 0;
140 error:
141  return vorbis_error_to_averror(ret);
142 }
143 
144 /* How many bytes are needed for a buffer of length 'l' */
145 static int xiph_len(int l)
146 {
147  return 1 + l / 255 + l;
148 }
149 
151 {
152  LibvorbisContext *s = avctx->priv_data;
153 
154  /* notify vorbisenc this is EOF */
155  if (s->dsp_initialized)
156  vorbis_analysis_wrote(&s->vd, 0);
157 
158  vorbis_block_clear(&s->vb);
159  vorbis_dsp_clear(&s->vd);
160  vorbis_info_clear(&s->vi);
161 
163  ff_af_queue_close(&s->afq);
164  av_freep(&avctx->extradata);
165 
166  return 0;
167 }
168 
170 {
171  LibvorbisContext *s = avctx->priv_data;
172  ogg_packet header, header_comm, header_code;
173  uint8_t *p;
174  unsigned int offset;
175  int ret;
176 
177  vorbis_info_init(&s->vi);
178  if ((ret = libvorbis_setup(&s->vi, avctx))) {
179  av_log(avctx, AV_LOG_ERROR, "encoder setup failed\n");
180  goto error;
181  }
182  if ((ret = vorbis_analysis_init(&s->vd, &s->vi))) {
183  av_log(avctx, AV_LOG_ERROR, "analysis init failed\n");
184  ret = vorbis_error_to_averror(ret);
185  goto error;
186  }
187  s->dsp_initialized = 1;
188  if ((ret = vorbis_block_init(&s->vd, &s->vb))) {
189  av_log(avctx, AV_LOG_ERROR, "dsp init failed\n");
190  ret = vorbis_error_to_averror(ret);
191  goto error;
192  }
193 
194  vorbis_comment_init(&s->vc);
195  vorbis_comment_add_tag(&s->vc, "encoder", LIBAVCODEC_IDENT);
196 
197  if ((ret = vorbis_analysis_headerout(&s->vd, &s->vc, &header, &header_comm,
198  &header_code))) {
199  ret = vorbis_error_to_averror(ret);
200  goto error;
201  }
202 
203  avctx->extradata_size = 1 + xiph_len(header.bytes) +
204  xiph_len(header_comm.bytes) +
205  header_code.bytes;
206  p = avctx->extradata = av_malloc(avctx->extradata_size +
208  if (!p) {
209  ret = AVERROR(ENOMEM);
210  goto error;
211  }
212  p[0] = 2;
213  offset = 1;
214  offset += av_xiphlacing(&p[offset], header.bytes);
215  offset += av_xiphlacing(&p[offset], header_comm.bytes);
216  memcpy(&p[offset], header.packet, header.bytes);
217  offset += header.bytes;
218  memcpy(&p[offset], header_comm.packet, header_comm.bytes);
219  offset += header_comm.bytes;
220  memcpy(&p[offset], header_code.packet, header_code.bytes);
221  offset += header_code.bytes;
222  assert(offset == avctx->extradata_size);
223 
224  if ((ret = avpriv_vorbis_parse_extradata(avctx, &s->vp)) < 0) {
225  av_log(avctx, AV_LOG_ERROR, "invalid extradata\n");
226  return ret;
227  }
228 
229  vorbis_comment_clear(&s->vc);
230 
232  ff_af_queue_init(avctx, &s->afq);
233 
235  if (!s->pkt_fifo) {
236  ret = AVERROR(ENOMEM);
237  goto error;
238  }
239 
240  return 0;
241 error:
242  libvorbis_encode_close(avctx);
243  return ret;
244 }
245 
247  const AVFrame *frame, int *got_packet_ptr)
248 {
249  LibvorbisContext *s = avctx->priv_data;
250  ogg_packet op;
251  int ret, duration;
252 
253  /* send samples to libvorbis */
254  if (frame) {
255  const int samples = frame->nb_samples;
256  float **buffer;
257  int c, channels = s->vi.channels;
258 
259  buffer = vorbis_analysis_buffer(&s->vd, samples);
260  for (c = 0; c < channels; c++) {
261  int co = (channels > 8) ? c :
263  memcpy(buffer[c], frame->extended_data[co],
264  samples * sizeof(*buffer[c]));
265  }
266  if ((ret = vorbis_analysis_wrote(&s->vd, samples)) < 0) {
267  av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
268  return vorbis_error_to_averror(ret);
269  }
270  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
271  return ret;
272  } else {
273  if (!s->eof)
274  if ((ret = vorbis_analysis_wrote(&s->vd, 0)) < 0) {
275  av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
276  return vorbis_error_to_averror(ret);
277  }
278  s->eof = 1;
279  }
280 
281  /* retrieve available packets from libvorbis */
282  while ((ret = vorbis_analysis_blockout(&s->vd, &s->vb)) == 1) {
283  if ((ret = vorbis_analysis(&s->vb, NULL)) < 0)
284  break;
285  if ((ret = vorbis_bitrate_addblock(&s->vb)) < 0)
286  break;
287 
288  /* add any available packets to the output packet buffer */
289  while ((ret = vorbis_bitrate_flushpacket(&s->vd, &op)) == 1) {
290  if (av_fifo_space(s->pkt_fifo) < sizeof(ogg_packet) + op.bytes) {
291  av_log(avctx, AV_LOG_ERROR, "packet buffer is too small");
292  return AVERROR_BUG;
293  }
294  av_fifo_generic_write(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);
295  av_fifo_generic_write(s->pkt_fifo, op.packet, op.bytes, NULL);
296  }
297  if (ret < 0) {
298  av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
299  break;
300  }
301  }
302  if (ret < 0) {
303  av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
304  return vorbis_error_to_averror(ret);
305  }
306 
307  /* check for available packets */
308  if (av_fifo_size(s->pkt_fifo) < sizeof(ogg_packet))
309  return 0;
310 
311  av_fifo_generic_read(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);
312 
313  if ((ret = ff_alloc_packet(avpkt, op.bytes))) {
314  av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
315  return ret;
316  }
317  av_fifo_generic_read(s->pkt_fifo, avpkt->data, op.bytes, NULL);
318 
319  avpkt->pts = ff_samples_to_time_base(avctx, op.granulepos);
320 
321  duration = avpriv_vorbis_parse_frame(&s->vp, avpkt->data, avpkt->size);
322  if (duration > 0) {
323  /* we do not know encoder delay until we get the first packet from
324  * libvorbis, so we have to update the AudioFrameQueue counts */
325  if (!avctx->delay) {
326  avctx->delay = duration;
329  }
330  ff_af_queue_remove(&s->afq, duration, &avpkt->pts, &avpkt->duration);
331  }
332 
333  *got_packet_ptr = 1;
334  return 0;
335 }
336 
338  .name = "libvorbis",
339  .long_name = NULL_IF_CONFIG_SMALL("libvorbis Vorbis"),
340  .type = AVMEDIA_TYPE_AUDIO,
341  .id = AV_CODEC_ID_VORBIS,
342  .priv_data_size = sizeof(LibvorbisContext),
344  .encode2 = libvorbis_encode_frame,
346  .capabilities = CODEC_CAP_DELAY,
347  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
349  .priv_class = &class,
350  .defaults = defaults,
351 };
static const AVCodecDefault defaults[]
Definition: libvorbis.c:70
float, planar
Definition: samplefmt.h:72
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int dsp_initialized
vd has been initialized
Definition: libvorbis.c:57
AVOption.
Definition: opt.h:234
#define LIBVORBIS_FRAME_SIZE
Definition: libvorbis.c:46
int avpriv_vorbis_parse_frame(VorbisParseContext *s, const uint8_t *buf, int buf_size)
Get the duration for a Vorbis packet.
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:269
int size
Definition: avcodec.h:974
AVFifoBuffer * pkt_fifo
output packet buffer
Definition: libvorbis.c:55
AudioFrameQueue afq
frame queue for timestamps
Definition: libvorbis.c:62
AVCodec.
Definition: avcodec.h:2796
double iblock
impulse block bias option
Definition: libvorbis.c:60
static int64_t duration
Definition: avplay.c:246
int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int(*func)(void *, void *, int))
Feed data from a user-supplied callback to an AVFifoBuffer.
Definition: fifo.c:84
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
uint8_t
#define av_cold
Definition: attributes.h:66
AVOptions.
av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
Initialize AudioFrameQueue.
static av_cold int libvorbis_encode_close(AVCodecContext *avctx)
Definition: libvorbis.c:150
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1164
vorbis_info vi
vorbis_info used during init
Definition: libvorbis.c:52
ogg_packet op
ogg packet
Definition: libvorbis.c:59
static const AVOption options[]
Definition: libvorbis.c:65
static av_cold int libvorbis_encode_init(AVCodecContext *avctx)
Definition: libvorbis.c:169
uint8_t * data
Definition: avcodec.h:973
Vorbis audio parser.
void av_fifo_free(AVFifoBuffer *f)
Free an AVFifoBuffer.
Definition: fifo.c:38
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:991
vorbis_block vb
vorbis_block used for analysis
Definition: libvorbis.c:54
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:264
AVCodec ff_libvorbis_encoder
Definition: libvorbis.c:337
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#define CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:713
#define AVERROR(e)
Definition: error.h:43
sample_fmts
Definition: avconv_filter.c:68
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
static int vorbis_error_to_averror(int ov_err)
Definition: libvorbis.c:78
int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size, void(*func)(void *, void *, int))
Feed data from an AVFifoBuffer to a user-supplied callback.
Definition: fifo.c:107
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1144
#define CODEC_FLAG_QSCALE
Use fixed qscale.
Definition: avcodec.h:611
int rc_max_rate
maximum bitrate
Definition: avcodec.h:2127
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
const char * name
Name of the codec implementation.
Definition: avcodec.h:2803
static av_cold int libvorbis_setup(vorbis_info *vi, AVCodecContext *avctx)
Definition: libvorbis.c:88
int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
Add a frame to the queue.
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:531
int bit_rate
the average bitrate
Definition: avcodec.h:1114
static int libvorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: libvorbis.c:246
static char buffer[20]
Definition: seek-test.c:31
int ff_alloc_packet(AVPacket *avpkt, int size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1245
LIBAVUTIL_VERSION_INT
Definition: eval.c:55
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1811
const uint8_t ff_vorbis_encoding_channel_layout_offsets[8][8]
Definition: vorbis_data.c:36
NULL
Definition: eval.c:55
int av_fifo_space(AVFifoBuffer *f)
Return the amount of space in bytes in the AVFifoBuffer, that is the amount of data you can write int...
Definition: fifo.c:57
av_default_item_name
Definition: libvorbis.c:75
Libavcodec external API header.
AVSampleFormat
Audio Sample Formats.
Definition: samplefmt.h:61
AV_SAMPLE_FMT_NONE
Definition: avconv_filter.c:68
int sample_rate
samples per second
Definition: avcodec.h:1791
main external API structure.
Definition: avcodec.h:1050
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
a very simple circular buffer FIFO implementation
int extradata_size
Definition: avcodec.h:1165
#define AVERROR_BUG
Bug detected, please report the issue.
Definition: error.h:60
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
Encode extradata length to a buffer.
Definition: utils.c:2216
VorbisParseContext vp
parse context to get durations
Definition: libvorbis.c:61
Describe the class of an AVClass context structure.
Definition: log.h:33
#define BUFFER_SIZE
Definition: libvorbis.c:48
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:1130
vorbis_dsp_state vd
DSP state used for analysis.
Definition: libvorbis.c:53
vorbis_comment vc
VorbisComment info.
Definition: libvorbis.c:58
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:76
int av_fifo_size(AVFifoBuffer *f)
Return the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from ...
Definition: fifo.c:52
common internal api header.
int eof
end-of-file flag
Definition: libvorbis.c:56
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:61
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1092
int cutoff
Audio cutoff bandwidth (0 means "automatic")
Definition: avcodec.h:1835
AVClass * av_class
class for AVOptions
Definition: libvorbis.c:51
static int ogg_packet(AVFormatContext *s, int *str, int *dstart, int *dsize, int64_t *fpos)
Definition: oggdec.c:332
AVFifoBuffer * av_fifo_alloc(unsigned int size)
Initialize an AVFifoBuffer.
Definition: fifo.c:25
void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts, int *duration)
Remove frame(s) from the queue.
int channels
number of audio channels
Definition: avcodec.h:1792
#define FF_QP2LAMBDA
factor to convert from H.263 QP to lambda
Definition: avutil.h:207
void ff_af_queue_close(AudioFrameQueue *afq)
Close AudioFrameQueue.
#define LIBAVCODEC_IDENT
Definition: version.h:43
int avpriv_vorbis_parse_extradata(AVCodecContext *avctx, VorbisParseContext *s)
Initialize the Vorbis parser using headers in the extradata.
static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx, int64_t samples)
Rescale from sample rate to AVCodecContext.time_base.
Definition: internal.h:149
int rc_min_rate
minimum bitrate
Definition: avcodec.h:2134
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:169
This structure stores compressed data.
Definition: avcodec.h:950
int delay
Codec delay.
Definition: avcodec.h:1212
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:179
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:966
static int xiph_len(int l)
Definition: libvorbis.c:145